diff --git a/tests/files/StateTests/stSystemOperationsTest.json b/tests/files/StateTests/stSystemOperationsTest.json
index 781be3368..4120f3cab 100644
--- a/tests/files/StateTests/stSystemOperationsTest.json
+++ b/tests/files/StateTests/stSystemOperationsTest.json
@@ -4673,6 +4673,81 @@
             "value" : "100000"
         }
     },
+    "CallToNameRegistratorZeorSizeMemExpansion" : {
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "10000000",
+            "currentNumber" : "0",
+            "currentTimestamp" : 1,
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "logs" : [
+        ],
+        "out" : "0x",
+        "post" : {
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "1000000000000099977",
+                "code" : "0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff6000527faaffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffaa6020526000600060006000601773945304eb96065b2a98b57a48a06ae28d285a71b56103e8f1600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba" : {
+                "balance" : "1636",
+                "code" : "0x",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "945304eb96065b2a98b57a48a06ae28d285a71b5" : {
+                "balance" : "46",
+                "code" : "0x60003554156009570060203560003555",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "a94f5374fce5edbc8e2a8697c15331677e6ebf0b" : {
+                "balance" : "999999999999898364",
+                "code" : "0x",
+                "nonce" : "1",
+                "storage" : {
+                }
+            }
+        },
+        "pre" : {
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff6000527faaffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffaa6020526000600060006000601773945304eb96065b2a98b57a48a06ae28d285a71b56103e8f1600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "945304eb96065b2a98b57a48a06ae28d285a71b5" : {
+                "balance" : "23",
+                "code" : "0x60003554156009570060203560003555",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "a94f5374fce5edbc8e2a8697c15331677e6ebf0b" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        },
+        "transaction" : {
+            "data" : "",
+            "gasLimit" : "10000",
+            "gasPrice" : "1",
+            "nonce" : "0",
+            "secretKey" : "45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8",
+            "to" : "095e7baea6a6c7c4c2dfeb977efac326af552d87",
+            "value" : "100000"
+        }
+    },
     "CallToReturn1" : {
         "env" : {
             "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
@@ -5023,6 +5098,81 @@
             "value" : "100000"
         }
     },
+    "callcodeToNameRegistratorZeroMemExpanion" : {
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "10000000",
+            "currentNumber" : "0",
+            "currentTimestamp" : 1,
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "logs" : [
+        ],
+        "out" : "0x",
+        "post" : {
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "1000000000000100000",
+                "code" : "0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff6000527faaffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffaa6020526000600060006000601773945304eb96065b2a98b57a48a06ae28d285a71b56103e8f2600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba" : {
+                "balance" : "1636",
+                "code" : "0x",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "945304eb96065b2a98b57a48a06ae28d285a71b5" : {
+                "balance" : "23",
+                "code" : "0x60003554156009570060203560003555",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "a94f5374fce5edbc8e2a8697c15331677e6ebf0b" : {
+                "balance" : "999999999999898364",
+                "code" : "0x",
+                "nonce" : "1",
+                "storage" : {
+                }
+            }
+        },
+        "pre" : {
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff6000527faaffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffaa6020526000600060006000601773945304eb96065b2a98b57a48a06ae28d285a71b56103e8f2600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "945304eb96065b2a98b57a48a06ae28d285a71b5" : {
+                "balance" : "23",
+                "code" : "0x60003554156009570060203560003555",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "a94f5374fce5edbc8e2a8697c15331677e6ebf0b" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        },
+        "transaction" : {
+            "data" : "",
+            "gasLimit" : "1000000",
+            "gasPrice" : "1",
+            "nonce" : "0",
+            "secretKey" : "45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8",
+            "to" : "095e7baea6a6c7c4c2dfeb977efac326af552d87",
+            "value" : "100000"
+        }
+    },
     "callcodeToReturn1" : {
         "env" : {
             "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
diff --git a/tests/files/VMTests/vmBlockInfoTest.json b/tests/files/VMTests/vmBlockInfoTest.json
index 90fa77a3d..67ec9dbf8 100644
--- a/tests/files/VMTests/vmBlockInfoTest.json
+++ b/tests/files/VMTests/vmBlockInfoTest.json
@@ -1,4 +1,180 @@
 {
+    "blockhash257Block" : {
+        "callcreates" : [
+        ],
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "1000000",
+            "currentNumber" : "257",
+            "currentTimestamp" : "1",
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "code" : "0x600040600055",
+            "data" : "0x",
+            "gas" : "10000",
+            "gasPrice" : "100000000000000",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000"
+        },
+        "gas" : "9897",
+        "logs" : [
+        ],
+        "out" : "0x",
+        "post" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x600040600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        },
+        "pre" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x600040600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        }
+    },
+    "blockhash258Block" : {
+        "callcreates" : [
+        ],
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "1000000",
+            "currentNumber" : "258",
+            "currentTimestamp" : "1",
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "code" : "0x600140600055",
+            "data" : "0x",
+            "gas" : "10000",
+            "gasPrice" : "100000000000000",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000"
+        },
+        "gas" : "9897",
+        "logs" : [
+        ],
+        "out" : "0x",
+        "post" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x600140600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        },
+        "pre" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x600140600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        }
+    },
+    "blockhashMyBlock" : {
+        "callcreates" : [
+        ],
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "1000000",
+            "currentNumber" : "1",
+            "currentTimestamp" : "1",
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "code" : "0x600140600055",
+            "data" : "0x",
+            "gas" : "10000",
+            "gasPrice" : "100000000000000",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000"
+        },
+        "gas" : "9897",
+        "logs" : [
+        ],
+        "out" : "0x",
+        "post" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x600140600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        },
+        "pre" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x600140600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        }
+    },
+    "blockhashNotExistingBlock" : {
+        "callcreates" : [
+        ],
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "1000000",
+            "currentNumber" : "1",
+            "currentTimestamp" : "1",
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "code" : "0x600240600055",
+            "data" : "0x",
+            "gas" : "10000",
+            "gasPrice" : "100000000000000",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000"
+        },
+        "gas" : "9897",
+        "logs" : [
+        ],
+        "out" : "0x",
+        "post" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x600240600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        },
+        "pre" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x600240600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        }
+    },
     "coinbase" : {
         "callcreates" : [
         ],
@@ -178,51 +354,6 @@
             }
         }
     },
-    "prevhash" : {
-        "callcreates" : [
-        ],
-        "env" : {
-            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
-            "currentDifficulty" : "256",
-            "currentGasLimit" : "1000000",
-            "currentNumber" : "0",
-            "currentTimestamp" : "1",
-            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
-        },
-        "exec" : {
-            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
-            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
-            "code" : "0x40600055",
-            "data" : "0x",
-            "gas" : "10000",
-            "gasPrice" : "100000000000000",
-            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
-            "value" : "1000000000000000000"
-        },
-        "gas" : "9698",
-        "logs" : [
-        ],
-        "out" : "0x",
-        "post" : {
-            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
-                "balance" : "1000000000000000000",
-                "code" : "0x40600055",
-                "nonce" : "0",
-                "storage" : {
-                    "0x" : "0x5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
-                }
-            }
-        },
-        "pre" : {
-            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
-                "balance" : "1000000000000000000",
-                "code" : "0x40600055",
-                "nonce" : "0",
-                "storage" : {
-                }
-            }
-        }
-    },
     "timestamp" : {
         "callcreates" : [
         ],
diff --git a/tests/files/VMTests/vmEnvironmentalInfoTest.json b/tests/files/VMTests/vmEnvironmentalInfoTest.json
index 37563707b..88f22027e 100644
--- a/tests/files/VMTests/vmEnvironmentalInfoTest.json
+++ b/tests/files/VMTests/vmEnvironmentalInfoTest.json
@@ -416,6 +416,50 @@
             }
         }
     },
+    "calldatacopyZeroMemExpansion" : {
+        "callcreates" : [
+        ],
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "1000000",
+            "currentNumber" : "0",
+            "currentTimestamp" : "1",
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "code" : "0x60006000600037600051600055",
+            "data" : "0x01234567890abcdef01234567890abcdef",
+            "gas" : "100000000000",
+            "gasPrice" : "1000000000",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000"
+        },
+        "gas" : "99999999892",
+        "logs" : [
+        ],
+        "out" : "0x",
+        "post" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x60006000600037600051600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        },
+        "pre" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x60006000600037600051600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        }
+    },
     "calldatacopy_DataIndexTooHigh" : {
         "callcreates" : [
         ],
@@ -953,7 +997,7 @@
             }
         }
     },
-    "codecopy1" : {
+    "codecopyZeroMemExpansion" : {
         "callcreates" : [
         ],
         "env" : {
@@ -967,31 +1011,30 @@
         "exec" : {
             "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
             "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
-            "code" : "0x386000600039600051600055",
+            "code" : "0x60006000600039600051600055",
             "data" : "0x01234567890abcdef01234567890abcdef",
             "gas" : "100000000000",
             "gasPrice" : "1000000000",
             "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
             "value" : "1000000000000000000"
         },
-        "gas" : "99999999691",
+        "gas" : "99999999892",
         "logs" : [
         ],
         "out" : "0x",
         "post" : {
             "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
                 "balance" : "1000000000000000000",
-                "code" : "0x386000600039600051600055",
+                "code" : "0x60006000600039600051600055",
                 "nonce" : "0",
                 "storage" : {
-                    "0x" : "0x3860006000396000516000550000000000000000000000000000000000000000"
                 }
             }
         },
         "pre" : {
             "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
                 "balance" : "1000000000000000000",
-                "code" : "0x386000600039600051600055",
+                "code" : "0x60006000600039600051600055",
                 "nonce" : "0",
                 "storage" : {
                 }
@@ -1146,6 +1189,64 @@
             }
         }
     },
+    "extcodecopyZeroMemExpansion" : {
+        "callcreates" : [
+        ],
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "1000000",
+            "currentNumber" : "0",
+            "currentTimestamp" : "1",
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "code" : "0x",
+            "data" : "0x01234567890abcdef01234567890abcdef",
+            "gas" : "100000000000",
+            "gasPrice" : "123456789",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "1000000000000000000"
+        },
+        "gas" : "100000000000",
+        "logs" : [
+        ],
+        "out" : "0x",
+        "post" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "cd1722f3947def4cf144679da39c4c32bdc35681" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x6005600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        },
+        "pre" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "cd1722f3947def4cf144679da39c4c32bdc35681" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x6005600055",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        }
+    },
     "extcodecopy_DataIndexTooHigh" : {
         "callcreates" : [
         ],
diff --git a/vm/common.go b/vm/common.go
index acf18eede..f19b0fe4b 100644
--- a/vm/common.go
+++ b/vm/common.go
@@ -49,7 +49,7 @@ var (
 	S256 = ethutil.S256
 )
 
-const MaxCallDepth = 1024
+const MaxCallDepth = 1025
 
 func calcMemSize(off, l *big.Int) *big.Int {
 	if l.Cmp(ethutil.Big0) == 0 {